Github user viirya commented on the pull request:
https://github.com/apache/spark/pull/6645#issuecomment-109704819
As we can't know whether the string represents a fractional number or not,
casting to decimal seems being the most feasible approach? Because
`typeCoercionRules` is used in `Analyzer`, this casting might not only be
specific to Hive on Spark.
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